Mansfield is reported to be involved in the bid with Jason Bryant, the former Virgin Radio development director and Mike Franklin, former managing director of TalkSport.
The trio are thought to be advising National Grid Wireless, the transmission company behind Freeview on the bid.
National Grid Wireless was formerly known as Crown Castle Communications, which founded Freeview along with the BBC and BSkyB in 2002.
The organisation is currently up against Channel 4 in the race to run the alternative digital multiplex.
In December, the media regulator Ofcom called for applications for the second national digital multiplex licence, which will be awarded for a 12-year period.
The award will be made under the Broadcasting Act 1996, which requires Ofcom to consider how each applicant would promote the development of DAB radio in the UK.
The closing date for the receipt of applications is March 28, and a non-refundable fee of £50,000 is required for each application submitted.
Former Ofcom chief executive Stephen Carter has previously hinted that two extra national digital multiplexes, capable of carrying 20 stations may be offered in addition to the original multiplex, which was awarded in 1998.
The first digital multiplex was awarded to Digital One, a joint venture backed by GCap Media and Arqiva, a technical supplier to the radio broadcast industry.
A former colleague of Mansfield, current GCap Media chief executive Ralph Bernard had previously opposed the launch of a second digital multiplex, as it argued that the original terms of the agreement with Digital One had been based on a degree of exclusivity.
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